Research Gallery

Extragalactic Astronomy

A Cool Core Disturbed: Observational Evidence for the Coexistence of Subsonic Sloshing Gas and Stripped Shock-heated Gas around the Core of RX J1347.5-1145
Top Left: X-ray surface brightness of the galaxy cluster RX J1347.5-1145 taken by the Chandra X-ray Observatory. The white contours show the surface mass density map of this galaxy cluster
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STUDIES (SCUBA-2 Ultra Deep Imaging EAO Survey)
STUDIES is a multi-year JCMT Large Program, to obtain extremely deep submillimeter images of the distant universe. The goal is to understand the origin of the far-infrared cosmic background radiation
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Atmospheric gas dynamics in the Perseus cluster observed with Hitomi
Left: Bulk velocity (v_bulk) map of the intracluster medium in the core of the X-ray brightest galaxy cluster, the Perseus cluster, with respect to the redshift z = 0.017284 (heliocentric
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First results on the cluster galaxy population from the Subaru Hyper Suprime-Cam survey. I. The role of group or cluster environment in star formation quenching from z = 0.2 to 1.1
Top: Median sSFR of SF galaxies as a function of redshift in the field (dotted), groups (dashed), and clusters (solid). Bottom: The logarithmic ratio of sSFR for group to field
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Dust evolution simulation in a spiral galaxy
We simulated the evolution of a spiral galaxy with N-body/SPH (Aoyama, Hou, Hirashita, et al. 2017). We implemented the evolution of dust in the simulation. This figure shows the face-on
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Discovery of a Strong Lens Galaxy Embedded in a Cluster at z = 1.62
Hubble Space Telescope image of the most distant strong lensing galaxy known at z = 1.62.
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The first ALMA-Taiwan result published with Cycle 0 data
The first ALMA-Taiwan result published with Cycle 0 data. Gamma-ray burst host galaxies are observed at 345 GHz with ALMA (left panels) and compared to Hubble Space Telescope images (right).
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Predictions of the stellar mass growth of BCGs
The green triangles represent predictions of the stellar mass growth of BCGs by a highly successful galaxy formation model (Guo et al. 2011), which are found to agree fairly well
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BCG
a picture of a galaxy cluster observed by the WISE and Spitzer Space Telescopes. The bright galaxy at the center is the BCG.
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Hubble Takes Movies of Space Slinky in M87
This sequence of images, taken over a 13-year span by NASA's Hubble Space Telescope, reveals changes in a black-hole-powered jet of hot gas in the giant elliptical galaxy M87. The
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Rotation measure gradient in 3C 216
Left: VLBA rotation measure (RM) map of 3C 216 from 12 to 24 GHz. A clear gradient transverse to the direction of the jet is observed. Thick line indicates the
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Toward the Innermost Region of the Relativistic Jet from Supermassive Black Hole in the Active Galactic Nuclues M87
Global structure of the M87 jet is examined by multi-frequency observations. Figure shows that distribution of the radius ($r$) of the jet as a function of the de-projected distance ($z$)
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Infrared Hubble Deep Field
Hubble Deep Feild and its surrounding field in the infrared. The color image is a combination and deep images taken at 2.1 um (blue) by CFHT, 3.6 and 4.5 um
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Clustering radius vs. specific star formation rate of z ~ 2 star forming galaxies
For galaxies with SSFR smaller than this critical point, the hosting halo mass increases, implying that the environmental quenching effect has taken place as
early as z ~ 2. On
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ALMA Detection of the Host Galaxy of gamma-Ray Burst GRB 080607
GRB 080607 is a gamma-ray burst from the distant universe of 12 billion light year away (z = 3.036). It is also a dark burst, whose optical light is strongly
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The center of the TENIS field.
In this color picture, blue is the Hubble Space Telescope z-band image, green is our TENIS J-band image, and red is TENIS Ks-band image. The square is the famous Hubble
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Baryon Content of Galaxy Clusters at z=0-0.6
The upper panel shows the baryon mass fraction, while the lower panel shows the stellar mass fraction. The solid and open circles are clusters from two different z=0.1-0.6 samples, and
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On the Populations of Radio Galaxies with Extended Morphology at z < 0.3
Mean SDSS spectra of RGs of different morphologies and different SMBH masses. From left to right, the columns are of increasing ranges of SMBH mass. Within each column, the top
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A simple approach to the high-redshift sub-millimeter galaxies
Simulated galaxy distribution. Each point corresponds to an individual
galaxy, whose luminosity of dust emission at a submillimeter
wavelength of 0.85mm is calculated individually. Therefore, the figure
predicts the early
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Discovery of a spiral-host episodic radio galaxy
An exotic galaxy nick-named 'Speca' (Spiral-host Episodic radio-galaxy(AGN) tracing Cluster Accretion) has been discovered. Above is the composite image of Speca: Optical SDSS image of the galaxies in yellow, low
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Multi-transition CO images toward the Whirlpool galaxy M51
Multi-transition CO images toward the Whirlpool galaxy M51. The images show stronger intensity toward the nucleus in the higher CO transitions, suggesting that the molecular gas around the AGN is
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The center of a nearby barred galaxy M83
The center of a nearby barred galaxy M83. The SMA data in contours show the distribution of cold gas along dust lanes and a starburst ring (Sakamoto et al. 2004,
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Numerical simulation of the structure of NGC 1300 under a strong bar potential
Numerical simulation of the structure of NGC 1300 under a strong bar potential. The figures from left to right are the numerical result, observation, and their superposition, respectively.
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omparison between a numerical simulation result and M81
Comparison between a numerical simulation result (left) and M81 (right). M81 is a well studied case of spiral stellar potential driven shock and star formation. The secondary spiral structure observed
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Subaru/Suprime-Cam image of the distant cluster RXJ0152 at z=0.83
Top: Measurements of C, N, O and S isotopic abundance ratios in the arm of a spiral galaxy at a redshift of z=0.89 using the Plateau de Bure Interferometer. The
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